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CVE-2026-117601

9.3 critical SSVC exploitation: none Published
NVD · CVE.org

Electrum before 4.8.3 fails to verify signatures of wallet-owned inputs in unconfirmed mempool transactions, allowing malicious servers to replace a just-broadcast transaction with a conflicting one. Attackers can swallow the user's transaction and display an invalid zero-fee copy paying an attacker address, tricking users into RBF fee-bumping and signing it.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 8

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-28 16:16
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-28 17:18
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-27 13:09
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-27 16:03
  5. StatusReceived → PublishedNVD modified 2026-10-27 13:09
  6. StatusPublished → ReceivedNVD modified 2026-10-27 14:16
  7. CVSS9.3 (v4.0, CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) → 9.3 (v4.0, CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)NVD modified 2026-10-27 14:16
  8. First seenCVSS 9.3 · spesmiloNVD modified 2026-10-27 13:09

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3